I just tried to use the kernel 4.4 iio dummy module and compiled it against kernel 4.9. This works and creates an entry in sysfs. To prevent dependencies I made an #undef CONFIG_IIO_SIMPLE_DUMMY_BUFFER > Am 05.06.2017 um 16:33 schrieb Franziska Näpelt <franziska.naepelt@xxxxxxxxxxxxxx>: > > Hi, > > I’m just playing around with iio dummy drivers and couldn’t get it work with kernel 4.9 while everything was fine with > kernel 4.4. > > Steps for kernel 4.4: > * edit Kconfig to create IIO_SIMPLE_DUMMY module > * build and install kernel > * edit /etc/modules to load iio_dummy > * after reboot there is an iio_dummy module loaded and the device appears in sysfs > > Steps for kernel 4.9: > * edit Kconfig to create IIO_SW_DEVICE, IIO_SIMPLE_DUMMY, IIO_SIMPLE_DUMMY_BUFFER modules > * build and install kernel > * edit /etc/modules to load iio_dummy > * after reboot there is an iio_dummy module loaded but doesn’t appear in sysfs > > Is there something wrong with the order, loading modules or do I miss some dependencies? > > Thanks, > Franziska > > Here are some more detailed information, as first kernel 4.4, then 4.9: > > Linux raspberrypi-3 4.4.50-v7+ #1 SMP Fri Jun 2 00:19:42 CEST 2017 armv7l GNU/Linux > --- > pi@raspberrypi-3:~/projects $ cat /etc/modules > # /etc/modules: kernel modules to load at boot time. > # > # This file contains the names of kernel modules that should be loaded > # at boot time, one per line. Lines beginning with "#" are ignored. > > iio_dummy > --- > pi@raspberrypi-3:~/projects/raspi-linux $ git diff drivers/staging/iio/Kconfig > diff --git a/drivers/staging/iio/Kconfig b/drivers/staging/iio/Kconfig > index 9d7f000..42d03a3 100644 > --- a/drivers/staging/iio/Kconfig > +++ b/drivers/staging/iio/Kconfig > @@ -23,6 +23,7 @@ config IIO_DUMMY_EVGEN > > config IIO_SIMPLE_DUMMY > tristate "An example driver with no hardware requirements" > + default y > help > Driver intended mainly as documentation for how to write > a driver. May also be useful for testing userspace code > --- > pi@raspberrypi-3:~/projects $ lsmod > Module Size Used by > bnep 10340 2 > hci_uart 17943 1 > btbcm 5929 1 hci_uart > bluetooth 326067 22 bnep,btbcm,hci_uart > brcmfmac 186282 0 > brcmutil 5661 1 brcmfmac > cfg80211 428833 1 brcmfmac > rfkill 16018 4 cfg80211,bluetooth > snd_bcm2835 20447 0 > snd_pcm 75890 1 snd_bcm2835 > snd_timer 19288 1 snd_pcm > bcm2835_gpiomem 2976 0 > snd 51908 3 snd_bcm2835,snd_timer,snd_pcm > bcm2835_wdt 3225 0 > uio_pdrv_genirq 3164 0 > uio 8000 1 uio_pdrv_genirq > iio_dummy 3072 0 > industrialio 33826 1 iio_dummy > ipv6 347563 32 > --- > pi@raspberrypi-3:/sys/bus/iio/devices/iio:device0 $ ll > insgesamt 0 > drwxr-xr-x 3 root root 0 Jun 4 13:42 . > drwxr-xr-x 10 root root 0 Jun 4 13:42 .. > -r--r--r-- 1 root root 4,0K Jun 4 13:42 dev > -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_accel_x_calibbias > -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_accel_x_calibscale > -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_accel_x_raw > -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_activity_running_input > -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_activity_walking_input > -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_sampling_frequency > -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_steps_calibheight > -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_steps_en > -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_steps_input > -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_voltage0_offset > -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_voltage0_raw > -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_voltage0_scale > -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_voltage1-voltage2_raw > -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_voltage3-voltage4_raw > -rw-r--r-- 1 root root 4,0K Jun 4 13:42 in_voltage-voltage_scale > -r--r--r-- 1 root root 4,0K Jun 4 13:42 name > -rw-r--r-- 1 root root 4,0K Jun 4 13:42 out_voltage0_raw > drwxr-xr-x 2 root root 0 Jun 4 13:42 power > lrwxrwxrwx 1 root root 0 Jun 4 13:42 subsystem -> ../../bus/iio > -rw-r--r-- 1 root root 4,0K Jun 4 13:42 uevent > ------------------------------------------------------------------------------------------------------------------------- > Linux raspberrypi-3 4.9.30-v7+ #1 SMP Sun Jun 4 21:07:31 CEST 2017 armv7l GNU/Linux > --- > /etc/modules -> is the same > --- > pi@raspberrypi-3:~/projects/raspi-linux $ git diff drivers/iio/Kconfig > diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig > index 6743b18..e804f63 100644 > --- a/drivers/iio/Kconfig > +++ b/drivers/iio/Kconfig > @@ -49,6 +49,7 @@ config IIO_CONSUMERS_PER_TRIGGER > config IIO_SW_DEVICE > tristate "Enable software IIO device support" > select IIO_CONFIGFS > + default y > help > Provides IIO core support for software devices. A software > device can be created via configfs or directly by a driver > --- > pi@raspberrypi-3:~/projects/raspi-linux $ git diff drivers/iio/dummy/Kconfig > diff --git a/drivers/iio/dummy/Kconfig b/drivers/iio/dummy/Kconfig > index aa5824d..1eb7991 100644 > --- a/drivers/iio/dummy/Kconfig > +++ b/drivers/iio/dummy/Kconfig > @@ -11,6 +11,7 @@ config IIO_DUMMY_EVGEN > config IIO_SIMPLE_DUMMY > tristate "An example driver with no hardware requirements" > depends on IIO_SW_DEVICE > + default y > help > Driver intended mainly as documentation for how to write > a driver. May also be useful for testing userspace code > @@ -29,6 +30,7 @@ config IIO_SIMPLE_DUMMY_BUFFER > select IIO_BUFFER > select IIO_TRIGGER > select IIO_KFIFO_BUF > + default y > help > Add buffered data capture to the simple dummy driver. > --- > pi@raspberrypi-3:~/projects/raspi-linux $ lsmod > Module Size Used by > bnep 12051 2 > hci_uart 20020 1 > btbcm 7916 1 hci_uart > bluetooth 365473 22 hci_uart,bnep,btbcm > brcmfmac 222798 0 > brcmutil 9092 1 brcmfmac > cfg80211 542989 1 brcmfmac > rfkill 20832 4 bluetooth,cfg80211 > snd_bcm2835 24427 0 > snd_pcm 98565 1 snd_bcm2835 > snd_timer 23904 1 snd_pcm > bcm2835_gpiomem 3940 0 > snd 70032 3 snd_timer,snd_bcm2835,snd_pcm > uio_pdrv_genirq 3923 0 > fixed 3285 0 > uio 10268 1 uio_pdrv_genirq > iio_dummy 4984 0 > industrialio_sw_device 3691 1 iio_dummy > industrialio_configfs 1370 1 industrialio_sw_device > kfifo_buf 3668 1 iio_dummy > industrialio 62929 2 iio_dummy,kfifo_buf > ipv6 408530 32 > --- > pi@raspberrypi-3:/sys/bus/iio/devices $ ll > insgesamt 0 > drwxr-xr-x 2 root root 0 Jun 5 15:33 . > drwxr-xr-x 4 root root 0 Jun 5 15:33 .. > > > > -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
